Generating Bessel beams with broad depth-of-field by using phase-only acoustic holograms
| Autor: | Francisco Camarena, Noé Jiménez, Sergio Jiménez-Gambín, Jose M. Benlloch |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Holography
Phase (waves) lcsh:Medicine 02 engineering and technology Bessel beams 01 natural sciences Article law.invention symbols.namesake Optics law 0103 physical sciences Focal length lcsh:Science 010306 general physics Physics Multidisciplinary business.industry lcsh:R Metamaterial Acoustics Acoustic holograms 021001 nanoscience & nanotechnology Wavelength Metamaterials FISICA APLICADA Bessel beam symbols lcsh:Q 0210 nano-technology business Beam (structure) Bessel function |
| Zdroj: | Scientific Reports RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname Scientific Reports, Vol 9, Iss 1, Pp 1-13 (2019) |
| DOI: | 10.1038/s41598-019-56369-z |
| Popis: | [EN] We report zero-th and high-order acoustic Bessel beams with broad depth-of-field generated using acoustic holograms. While the transverse field distribution of Bessel beams generated using traditional passive methods is correctly described by a Bessel function, these methods present a common drawback: the axial distribution of the field is not constant, as required for ideal Bessel beams. In this work, we experimentally, numerically and theoretically report acoustic truncated Bessel beams of flat-intensity along their axis in the ultrasound regime using phase-only holograms. In particular, the beams present a uniform field distribution showing an elongated focal length of about 40 wavelengths, while the transverse width of the beam remains smaller than 0.7 wavelengths. The proposed acoustic holograms were compared with 3D-printed fraxicons, a blazed version of axicons. The performance of both phase-only holograms and fraxicons is studied and we found that both lenses produce Bessel beams in a wide range of frequencies. In addition, high-order Bessel beam were generated. We report first order Bessel beams that show a clear phase dislocation along their axis and a vortex with single topological charge. The proposed method may have potential applications in ultrasonic imaging, biomedical ultrasound and particle manipulation applications using passive lenses. This work was supported by the Spanish Ministry of Economy and Innovation (MINECO) through Project TEC2016-80976-R. NJ and SJ acknowledge financial support from Generalitat Valenciana through grants APOSTD/2017/042, ACIF/2017/045 and GV/2018/11. FC acknowledges financial support from Agencia Valenciana de la Innovacio through grant INNCON00/18/9 and European Regional Development Fund (IDIFEDER/2018/022). |
| Databáze: | OpenAIRE |
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